What do you mean by Ethernet socket? Is this in an office, and is jut one Ethernet outlet on the wall? Is this a cable modem with one Ethernet socket available? What is the situation here. Generally you need a router, switch, or hub to get more than one machine on with only one socket. Or configure a computer that has more than one network card into one of those rolls.
–
PaperlanternJan 7 '12 at 4:15

1

You will need one computer with at least two NICs. The second NIC needs to be matching with the second computer (meaning WiFi -> WiFi or Ethernet -> Ethernet). Using Windows Internet Connection Sharing, you can get internet access on the second computer through the first one.
–
kobaltzJan 7 '12 at 4:29